my 2 cents on the MIG vs. TIG thing... at our shop we do mostly ASME pressure piping and pressure vessels. and for the really big vessels we usually do TIG root with sub arc the rest of the way out. for the piping we spin everything we can again using a TIG root and usually STT the rest of the way out or if its a funky elbow we TIG it out. flux core and solid wire MIG is really only used for structural stuff around here.

Wonder if anyone has ever welded gears? I am looking to remove the centre out of a helical cut crank pinion, and fit it with the teeth from a straight cut gear. Can get the cutting done very accurately with EDM, just wondering what filler might be best to use?

Wonder if anyone has ever welded gears? I am looking to remove the centre out of a helical cut crank pinion, and fit it with the teeth from a straight cut gear. Can get the cutting done very accurately with EDM, just wondering what filler might be best to use?

Have some "keys" cut in the parts...to interlock them, taking the load directly off the weld..

I have built the worn dogs up on transmission gears using P-20 and H-13..with good results.

Wonder if anyone has ever welded gears? I am looking to remove the centre out of a helical cut crank pinion, and fit it with the teeth from a straight cut gear. Can get the cutting done very accurately with EDM, just wondering what filler might be best to use?

I have welded lots of spider gears in rear-ends together with just plain old ER70-2, they are all still turning. and most of those were late night projects with 2 much beer and not enough metal prep

I have a little (15#) CO2 tank I picked up off of CL a while back figuring I'd use it for welding (didn't have one at the time) or keg beer. I recently picked up a PowerMig 180. I got it running & tested with my little tank. That tank is empty now and I'm hearing that the local places don't like to fill owner tanks and that I maybe should be running 75/25 Ar/CO2 instead of just CO2?

I don't really have a set use for it yet...repairing the horse trailer, this & that around the house as needed.